<template>
  <view>
    <!-- 搜索模块 -->
    <ugo-search></ugo-search>
    <!-- 主体区域 -->
    <view class="m-category">
      <scroll-view scroll-y class="left">
        <view class="item" 
        v-for="(item,index) in cateLeft" 
        :key="item.cat_id"
        @click="getActiveIndex(index)"
        :class="{active:index===activeIndex}"
        >{{ item.cat_name }}</view>
      </scroll-view>
      <scroll-view scroll-y class="right" :scrollTop="scrollTop">
        <view class="cate" v-for="item in cateRight" :key="item.cat_id" >
          <view class="title">{{ item.cat_name }}</view>
          <view class="goods-list">
            <navigator class="goods" v-for="goods in item.children" :key="goods.cat_id"  :url="`/pages/goods_list/index?query=${goods.cat_name}&cid=${goods.cat_id}`">
              <image
                :src="goods.cat_icon"
                class="pic"
                mode="aspectFit"
               
              />
              <view class="name">{{ goods.cat_name }}</view>
            </navigator>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
export default {
  data(){
    return {   
    cateList:[],
    activeIndex:0,
    scrollTop:-1
  }
  },
  onLoad(){
    this.getCateList()
  },
  computed:{
    cateLeft(){
      return this.cateList.map(item=> {
        return {
          cat_id:item.cat_id,
          cat_name:item.cat_name
        }
      })
    },
    cateRight(){
      return this.cateList.length?this.cateList[this.activeIndex].children:[]
    }
   
  },
  methods: {
    async getCateList(){
      const res = await uni.$u.http.get('/categories')
      this.cateList=res.data.message
      console.log('商品列表',this.cateList);
    },
    getActiveIndex(index){
      this.activeIndex=index
      this.scrollTop = this.scrollTop ? 0 : -1;
      // this.scrollTop=1
      // this.$nextTick(()=>this.scrollTop=0)
    },

  }
};
</script>

<style lang="scss">
.m-category {
  display: flex;
  height: calc(100vh - 20rpx - 34px);
  .left {
    height: 100%;
    width: 182rpx;
    font-size: 28rpx;
    text-align: center;
    background-color: #F3F3F3;
    .item {
      padding: 17rpx 0;
      &.active{
        background: #fff;
        color: #ea4350;
        position: relative;
        &::before{
          content: '';
          position: absolute;
          left: 0;
          width: 4rpx;
          height: 44rpx;
          background: #ea4350;
        }
      }
    }
  }
  .right {
    height: 100%;
    flex: 1;
    .title{
      margin: 18rpx 0 21rpx;
      text-align: center;
    }
  }
}
.goods-list{
  display: flex;
  padding: 0 48rpx;
  justify-content: space-between;
  flex-wrap: wrap;
  .pic{
    width: 120rpx;
    height: 120rpx;
  }
  .name{
    margin-bottom: 30rpx;
    font-size: 21rpx;
    color: #2E2E2E;
    text-align: center;
    line-height: 1;
  }
}
</style>
